Richard,
I completely agree with what you have written & appreciate your thorough analysis.
It has been my experience in working with leaders that they often struggle most with your last point, becoming comfortable functioning in both roles. It seems that often they are either good managers or good coaches but struggle with being both.
A question I would throw at you with the idea of manager/coach:
-Is it possible to effectively incorporate coaching into the day to day activities of managing or does it need to be a somewhat separate discussion/event?
I would love to hear your thoughts on… >>>